'\" te
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.TH POOL_GET_BINDING 3POOL "January 18, 2020"
.SH NAME
pool_get_binding, pool_set_binding, pool_get_resource_binding \- set and query
process to resource pool bindings
.SH SYNOPSIS
.nf
cc [ \fIflag\fR\&.\|.\|. ] \fIfile\fR\&.\|.\|. \fB-lpool\fR [ \fIlibrary\fR\&.\|.\|. ]
#include <pool.h>

\fBchar *\fR\fBpool_get_binding\fR(\fBpid_t\fR \fIpid\fR);
.fi

.LP
.nf
\fBint\fR \fBpool_set_binding\fR(\fBconst char *\fR\fIpool\fR, \fBidtype_t\fR \fIidtype\fR,
     \fBid_t\fR \fIid\fR);
.fi

.LP
.nf
\fBchar *\fR\fBpool_get_resource_binding\fR(\fBconst char *\fR\fItype\fR, \fBpid_t\fR \fIpid\fR);
.fi

.SH DESCRIPTION
The \fBpool_get_binding()\fR function returns the name of the pool on the
running system that contains the set of resources to which the given process is
bound. If no such pool exists on the system or the search returns more than one
pool (since the set of resources is referred to by more than one pool),
\fINULL\fR is  returned and the pool error value is set to
\fBPOE_INVALID_SEARCH\fR.
.sp
.LP
It is possible that one of the resources to which the given process is bound is
not associated with a pool. This could occur if a processor set was created
with one of the \fBpset_()\fR functions and the process was then bound to that
set. It could also occur if the process was bound to a resource set not
currently associated with a pool, since resources can exist that are not
associated with a pool.
.sp
.LP
The \fBpool_set_binding()\fR function binds the processes matching \fIidtype\fR
and \fIid\fR to the resources associated with \fIpool\fR on the running system.
This function requires the privilege required by the underlying resource types
referenced by the pool; generally, this requirement is equivalent to requiring
superuser privilege.
.sp
.LP
The \fIidtype\fR parameter can be one of the following types:
.sp
.ne 2
.na
\fB\fBP_PID\fR\fR
.ad
.RS 12n
The \fIid\fR parameter is a pid.
.RE

.sp
.ne 2
.na
\fB\fBP_TASKID\fR\fR
.ad
.RS 12n
The \fIid\fR parameter is a taskid.
.RE

.sp
.ne 2
.na
\fB\fBP_PROJID\fR\fR
.ad
.RS 12n
The \fIid\fR parameter is a project ID. All currently running processes
belonging to the given project will be bound to the pool's resources.
.RE

.sp
.LP
The \fBpool_get_resource_binding()\fR function returns the name of the resource
of the supplied type to which the supplied process is bound.
.sp
.LP
The application must explicitly free the memory allocated for the return values
for \fBpool_get_binding()\fR and \fBpool_get_resource_binding()\fR.
.SH RETURN VALUES
Upon successful completion, \fBpool_get_binding()\fR returns the name of the
pool to which the process is bound. Otherwise it returns \fINULL\fR and
\fBpool_error\fR(3POOL) returns the pool-specific error value.
.sp
.LP
Upon successful completion, \fBpool_set_binding()\fR returns \fBPO_SUCCESS\fR.
Otherwise, it returns \fBPO_FAIL\fR and \fBpool_error()\fR returns the
pool-specific error value.
.sp
.LP
Upon successful completion, \fBpool_get_resource_binding()\fR returns the name
of the resource of the specified type to which the process is bound. Otherwise
it returns \fINULL\fR and \fBpool_error()\fR returns the pool-specific error
value.
.SH ERRORS
The \fBpool_get_binding()\fR function will fail if:
.sp
.ne 2
.na
\fB\fBPOE_INVALID_CONF\fR\fR
.ad
.RS 22n
The configuration is invalid.
.RE

.sp
.ne 2
.na
\fB\fBPOE_INVALID_SEARCH\fR\fR
.ad
.RS 22n
It is not possible to determine the binding for this target due to the
overlapping nature of the pools configured for this system, or the pool could
not be located.
.RE

.sp
.ne 2
.na
\fB\fBPOE_SYSTEM\fR\fR
.ad
.RS 22n
A system error has occurred. Check the system error code for more details.
.RE

.sp
.LP
The \fBpool_set_binding()\fR function will fail if:
.sp
.ne 2
.na
\fB\fBPOE_INVALID_SEARCH\fR\fR
.ad
.RS 22n
The pool could not be found.
.RE

.sp
.ne 2
.na
\fB\fBPOE_INVALID_CONF\fR\fR
.ad
.RS 22n
The configuration is invalid.
.RE

.sp
.ne 2
.na
\fB\fBPOE_SYSTEM\fR\fR
.ad
.RS 22n
A system error has occurred. Check the system error code for more details.
.RE

.sp
.LP
The \fBpool_get_resource_binding()\fR function will fail if:
.sp
.ne 2
.na
\fB\fBPOE_INVALID_CONF\fR\fR
.ad
.RS 22n
The configuration is invalid.
.RE

.sp
.ne 2
.na
\fB\fBPOE_INVALID_SEARCH\fR\fR
.ad
.RS 22n
The target is not bound to a resource of the specified type.
.RE

.sp
.ne 2
.na
\fB\fBPOE_SYSTEM\fR\fR
.ad
.RS 22n
A system error has occurred. Check the system error code for more details.
.RE

.SH EXAMPLES
\fBExample 1 \fRBind the current process to the pool named "target".
.sp
.in +2
.nf
#include <sys/types.h>
#include <pool.h>
#include <unistd.h>

\&...

id_t pid = getpid();

\&...

if (pool_set_binding("target", P_PID, pid) == PO_FAIL) \{
        (void) fprintf(stderr, "pool binding failed (%d)\\n",
                 pool_error());
\}
.fi
.in -2

.SH ATTRIBUTES
See \fBattributes\fR(7) for descriptions of the following attributes:
.sp

.sp
.TS
box;
c | c
l | l .
ATTRIBUTE TYPE	ATTRIBUTE VALUE
_
CSI	Enabled
_
Interface Stability	Unstable
_
MT-Level	Safe
.TE

.SH SEE ALSO
.BR libpool (3LIB),
.BR pool_error (3POOL),
.BR attributes (7)
